Expansion tanks store and protect excess coolant from your air conditioning system. When coolant reaches a high temperature, the liquid expands. Without the expansion tanks, this excess coolant would leak onto the road.
Coolant is a mixture of antifreeze and water which is constantly circulating in the car’s coolant system to stop the engine from overheating. Long drives or quick accelerations increase engine heat, which in turn causes the expansion. You can thank the expansion tanks for making sure that coolant is not lost every time your engine heats up!
Expansion tank installation
Have an expansion tank malfunction? Radiator cap problems? Need a coolant leak fix?
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